1 files changed, 1 insertions, 1 deletions

diff --git a/include/opkele/tidy.h b/include/opkele/tidy.h
index 059656d..039d13a 100644
--- a/include/opkele/tidy.h
+++ b/include/opkele/tidy.h
@@ -47,13 +47,13 @@ namespace opkele {
                 tidy_doc_t& operator=(TidyDoc x) {
                     if(_x) tidyRelease(_x);
                     _x = x;
                     return *this;
                 }
 
-                operator const TidyDoc(void) const { return _x; }
+                operator TidyDoc(void) const { return _x; }
                 operator TidyDoc(void) { return _x; }
 
                 inline bool opt_set(TidyOptionId o,bool v) {
                     assert(_x);
                     return tidyOptSetBool(_x,o,v?yes:no); }
                 inline bool opt_set(TidyOptionId o,int v) {